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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Balance Sheet Impact of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets $ 1,512 $ 1,632 $ 1,553
Non-Current Assets 27,965 19,643 16,182
Total assets 29,477 21,275 17,735
Current Liabilities 1,564 1,515 1,210
Non-Current Liabilities 14,439 10,116 9,349
Total liabilities 16,003 11,631 $ 10,559
Associates and Joint Ventures      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 2,822 1,925  
Non-Current Assets 37,553 33,509  
Total assets 40,375 35,434  
Current Liabilities 2,887 4,016  
Non-Current Liabilities 17,688 15,053  
Total liabilities 20,575 19,069  
Total Net Assets 19,800 16,365  
Attributable to Other Ownership Interests 14,228 11,638  
Attributable to Partnership's Share 5,572 4,727  
Brazilian toll roads      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 304 263  
Non-Current Assets 5,769 4,977  
Total assets 6,073 5,240  
Current Liabilities 602 823  
Non-Current Liabilities 2,102 1,665  
Total liabilities 2,704 2,488  
Total Net Assets 3,369 2,752  
Attributable to Other Ownership Interests 1,654 1,247  
Attributable to Partnership's Share 1,715 1,505  
North American natural gas transmission operation      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 139 122  
Non-Current Assets 4,741 5,767  
Total assets 4,880 5,889  
Current Liabilities 139 1,353  
Non-Current Liabilities 2,716 2,925  
Total liabilities 2,855 4,278  
Total Net Assets 2,025 1,611  
Attributable to Other Ownership Interests 1,012 805  
Attributable to Partnership's Share 1,013 806  
Chilean electricity transmission operation      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 280 221  
Non-Current Assets 7,122 5,519  
Total assets 7,402 5,740  
Current Liabilities 181 142  
Non-Current Liabilities 3,874 3,234  
Total liabilities 4,055 3,376  
Total Net Assets 3,347 2,364  
Attributable to Other Ownership Interests 2,417 1,665  
Attributable to Partnership's Share 930 699  
European telecommunications infrastructure operation      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 464 328  
Non-Current Assets 6,281 5,437  
Total assets 6,745 5,765  
Current Liabilities 561 443  
Non-Current Liabilities 2,968 2,528  
Total liabilities 3,529 2,971  
Total Net Assets 3,216 2,794  
Attributable to Other Ownership Interests 2,602 2,258  
Attributable to Partnership's Share 614 536  
Brazilian rail business      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 743 460  
Non-Current Assets 6,131 5,265  
Total assets 6,874 5,725  
Current Liabilities 515 674  
Non-Current Liabilities 2,405 1,645  
Total liabilities 2,920 2,319  
Total Net Assets 3,954 3,406  
Attributable to Other Ownership Interests 3,518 3,030  
Attributable to Partnership's Share 436 376  
Australian port operation      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 198 171  
Non-Current Assets 2,281 2,166  
Total assets 2,479 2,337  
Current Liabilities 24 66  
Non-Current Liabilities 1,332 1,229  
Total liabilities 1,356 1,295  
Total Net Assets 1,123 1,042  
Attributable to Other Ownership Interests 932 861  
Attributable to Partnership's Share 191 181  
Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Current Assets 694 360  
Non-Current Assets 5,228 4,378  
Total assets 5,922 4,738  
Current Liabilities 865 515  
Non-Current Liabilities 2,291 1,827  
Total liabilities 3,156 2,342  
Total Net Assets 2,766 2,396  
Attributable to Other Ownership Interests 2,093 1,772  
Attributable to Partnership's Share $ 673 $ 624